I see that Rapamyacin is a mTor inhibitor. From my years of lurking r/fitness my understanding is that is the “growth pathway” that you want to activate for muscle building (with whey for example). But it doesn’t look like people with more muscular mass die early, even the opposite. Am I missing something?
People who are healthier have more muscle mass but adding muscle mass doesn't make you healthier. Muscle mass is a signal of health not a cause. You can look at bodybuilding lifespan for proof. Lots of bodybuilders die young despite adding on enormous amounts of muscle.
You can see the same with testosterone. Men with higher testosterone live longer but giving people testosterone doesn't increase lifespan.
I would guess they do die early compared to people of the same activity levels, they just tend to get so much more exercise than average that the effect is overwhelmed.
